Apparatus for varying the volume of discharge of rotary pumps



Aug. 14, 1951 c. E. KERR 2,564,483 APPARATUS FOR VARYING THE VOLUME OF 7 DISCHARGE OF ROTARY. PUMPS Original Filed May 27, 1946 3 Sheets-Sheet 1 POSITION I0. 4

\ INVENTOR rosmou no. a GHARLES E. KERR ATTORNEYS Aug. 14, 1951 c. E. KERR 2,564,483

APPARATUS FOR VARYING THE VOLUME 0F DISCHARGE OF ROTARY PUMPS I h s Original Filed May 27, 1946 3 S Gets 2 I 54, a 0 w x 4 36 e4 1 IE 4 b2 INVENTOR CHARLES E. KERR A ORNEYS Aug. 14, 1951 c. E. KERR APPARATUS FOR VARYING THE VOLUME OF DISCHARGE 0F ROTARY PUMPS Original Filed May 27, 1946 3 sheets-sheet 5 INVENTOR Gill/HES E. KERR ATTORNEYS Patented Aug. 14, 1951 APPARATUS FOR VARYIN G THE VOLUME OF DISCHARGE OF ROTARY PUMPS Charles E. Kerr, San Jose, Calif., assignor to Food Machinery and Chemical Corporation, a corporation of Delaware Application May 27, 1946, Serial No. 672,514

The present invention appertains to rotary pumps of the piston and shuttle type and relates more particularly to apparatus for varying the volume of discharge thereof.

The volume of liquid passing through and discharging irom these rotary pumps is determined by the amount of eccentricity of the piston and shuttle elements relative to the rotor of the pump and is varied by increasing or decreasing the eccentricity of the journal of the shuttle relative to the axis of rotation of the rotor. The adjustment of the eccentricity of the shuttle journal has heretofore been obtained by swinging the journal in an arcuate path relative to the axis of rotation of the rotor to the desired position. However, the adjustment of the shuttle journal in this manner reduces the suction efficiency of the pump if the journal is disposed at the discharge side of the rotor and causes a definite hammer or knock and considerable wear of the moving parts of the pump if the journal is disposed at the inlet side of the rotor.

It is, therefore, one object of the present invention to provide an apparatus for varying the volume of discharge of piston and shuttle type moving the shuttle journal of rotary pumps alon a straight line to thereby increase or decrease the eccentricity thereof relative to the axis of rotation of the rotor of the pump.

Another object is to provide a simple and efcient mechanism for efiecting straight line adjustment of the shuttle journal of rotary pumps in a plane normal to the flow of liquid through the pump. i

Another object is to provide an apparatus for accurately varying the volume of discharge of a shuttle and piston type rotary pump between its minimum and maximum limits while the pump is in operation.

Other and further objects and advantages of the present invention will be apparent from the following description and drawings in which:

Fig. 1 is a side elevation of a rotary pump embodying the present invention.

Fig. 2 is an end view of the pump taken along line 2-2 of Fig. 1.

Fig. 3 is a longitudinal section through the pump of Fig. 1 taken along line 3-3 thereof.

Fig. 4 is a fragmentary section taken along line 44 of Fig. 3.

Fig. 5 is a cross section through the pump taken along line 5'5 of Fig. 3.

|11 Claims. (Cl. 103-160) Fig. 6 is a cross section taken along line 66 of Fig. 3. Y

Figs. 7 to 10, inclusive, are views similar to Fig. 6 illustrating the mechanism for varying the volume of discharge of the pump in different positions, while Figs. 6A to 10A associated therewith diagrammatically illustrate the change or position of the movable parts illustrated in Figs. 6 to 10.

The pump illustrated in the accompanying drawings comprises a casing l5 provided with a cylindrical chamber l6 which is open at one side and a hub portion 11 extending from the other side of the casing concentric to the chamber IS. The casing I5 is provided with tubular portions 20 and 21 arranged diametrically opposite each other on the periphery of the casing l5. and having threaded ends adapted to receive standard fittings, not shown. These tubular portions 20 and 2! are provided withintake and discharge ports 22 and 23, respectively, communicating with the cylindrical chamber l 6 and establishin a line 1 along which the fluid flows into and out of the cylindrical chamber l6 during the operation of the pump.

Rotat'ably mounted within the cylindrical chamber It is a rotor 24 having a hub portion 25 extending into an annular recess 26 in the inner face of the casing 15 adjacent the hub H thereof. The hub portion 25 of the rotor 24 is fixed to a drive shaft 2'! which is rotatably supported in a bushing 28 disposed in the hub ll. The shaft 21 is sealed relative to the casing by a suitable packing 29 pressed against the bushing by a packing gland 30 which extends into the hub portion l1 and is forced toward the casing by bolts 3| (Fig. 1) The drive shaft 21 is adapted to be coupled to a motor or suitable drive mechanism, not shown, and both the bushing 28 and gland 30 maintain the drive shaft and rotor in position for rotation about an axis 0 in the pump casing.

The rotor 24 has a solid end wall 32 which extends radially from its hub portion '25 and a peripheral wall 34 which extends laterally from the end wall 32 toward the open side of the easing and fits into the cylindrical chamber IS. The rotor is provided with a diametrical slot 36 (Figs. 3, 4, and 5) which extends through the peripheral wall 3 4 and into and transversely of the inner :face of the solid end wall 32, as shown at 38a (Fig. 3) to provide a guide way 38. Slidably arranged within the guide way 38 of the rotor 24 is a liquid impeller in the form of a U-shaped piston 40 within which a shuttle block 42 is slidably disposed. The open sides Ma and Mb of the pissleeve 52.

relative to the boss'53.

to the longitudinal axis S thereof. The shaft 58' is rotatably mounted within an eccentric bore 5i of a sleeve 52 rotatably supported within a boss 1 or hub 53 of a cover 54 secured in liquidtight manner to the open side of the casing l5 by means of stud bolts and wing nuts 55. The longitudinal axis B of the hub 53 is disposed eccentric to the axis of the rotor 24 (Figs. 2 and 4) and is disposed in a plane designated A (Fig. 2) which is normal to the line 1 along which the fluid flows into and out of the pump.

The end'of: the'shaft 50- and the end of the sleeve 52 exposed to the cylindrical chamberlfi are provided with flared heads 56 and 5?, respectively, fitting into countersunk seats 5-8 and 59 provided in the sleeve 52' and cover 54, respectively, to seal the sleeve and shaft relative to the chamber is and to provide a flush surface on the inner face of thecover 54 adjacent the open side of the casing irrespective of the position of adjustment of the eccentric journal 68 relative thereto.

r 'The sleeve 52 extends beyond the free end of the boss '53 to receive a handle 68 having its radial axis H disposed normal to the sleeve 52. The handle 68 is keyed to the sleeve 52 for rotatin the same relative to the boss 53 when the handle is swung about the axis B of the boss.

' The handle 63 is provided with a pin '6! disposed normal to the axis H and parallel to the Fixed to one end or the pin BI is a pinion gear 62 which meshes with an annular rack or toothed flange 63 forming an integral part of the boss 53 for rotating the pinion gear 62 withrespect-to the handle 56 when the handle is swung in one or the other direction. Fixed to :the other end of the pin Bl at the outer side of the handle 63 is a gear 64 which meshes with a gear 65 keyed to the extended end of the shaft '58 for rotating the shaft 59 in a direction opposite to the direction of rotation of the sleeve when the handle is swung in one or the other direction about the axis B of the boss 53.

I The free end of the shaft 50 is of reduced diameter and threaded, as shown at 5'5, and a washer 61 and a wing nut 68 screwed onto the threaded end 66 are employed for securing the gear 65, sleeve 52, handle 60, and shaft 50 in place For purposes of clarity the eccentric journal 43 has been shown in Figs. 3 to 5 in its zero position,

that is, with its axis E disposedparallel to and coincident with the axis 0 of the rotor. When the journal is in this position, the handle 69 is in the position as illustrated in Fig. 1 and as shown in full lines in Fig. 2. Upon operation of the pump, i. e., rotation of the shaft 2'! and rotor vM while the journal 4% is in its zero position, the

shuttle block 42 and piston 48 will rotate concentric with the rotor 24 and, consequently; will not slide relative to each other and. the rotor 24 so that no pumping action is produced. However, if the journal 48 is shifted into a position eccentric to the axis 0. a sliding movement of the shuttle and piston relative to each other and the rotor is obt'aimed which produces a suction action Fig. 6A that the radial axis n of the handle an is disposed in the plane A, hereinbefore mentioned, and parallel to a line designated a. This line a traverses the line at right angles at the axis 0 and, to obtain an accurate adjustment of the volume of discharge of the pump and any desired variation thereof without reduction of the eihciency of the pump and without causing hammering and excessive wear of the pump, the journal 48 has'to be adjusted along th line 11.

Upon turning of the handle 60, the sleeve 52 will rotate concentric to the axis B of the boss 53 which is in fixed eccentric position relative to the axis 0 of the rotor 24. Since the shaft is disposed in the eccentric bore 5i of the sleeve 52, the aXis S of the shaft 50 is held at a fixed radial distance from the axis B but may be swung about the same to traverse'the line a, midway between theaxes O and B. The axis E of the eccentric journal 4 3 (Figs. 6 and 6A) coincides with the axis 0 of the rotor 2% when the handle is in position No. l and will swing about the axis S of the shaft 59 when said shaft is rotated within the sleeve 52.

Therefore, as the handle '60 is rotated about the axis B, the relationship between the annular rack 63 and the pinion gear 62 remains the same and the relationship of, the axis S of the shaft 50 with respect to the radial axisI-I of the handle remains the same so that the radius B-S always coincides with the radial axis H irrespective of the position of the handle;

The annular rack 63 of the boss 53 is provided with twice as many teeth as the pinion 62,,so that the ratio between the rack 63 and pinion 62 is two to one, and since the rack 63 isflxed, a turning of the handle, for example, one degree counterclockwise about the axis B (Fig. 6) will effect a two degree counterclockwise turn of the pinion gear 62 about the axis of the pin 61. The outer gears 64 and 65 are identical, i. e., of one to one ratio, and, since the pinion 62 and the gear 64 are both fixed to the pin Bl a two degree turn of the pinion B2 in counterclockwise direction (Fig. 6) causes a corresponding rotation of two degrees of the gear 64 while the latter in turn effects a two degree clockwise rotation of the gear 65. This rotation of the gear 65 is transmitted directly to the shaft 59 to which it is keyed and causes a two degree swing of the radius SE in clockwise direction during the one degree swing of the handle in counterclockwise direction. I

For explanatory purposes, the handle (Fig. 2) has been'indicated in several different dotted line positions designated Nos. 2, 3, 4, and 5, re-

spectively, and the adjustments of the sleeve 52 and journal 48 obtained upon movement of the handle 60 into these various positions are illustrated in Figs. 6 to 10 and diagrammatically explained in Figs. 6A to 10A, associated therewith.

When the handle is disposed in position No. 1, (Figs. 6 and 6A), the axes S and E of the shaft and eccentric journal, respectively, are in the plane A which is coincident to the line of adjustment a. Upon movement of the handle 45 degrees counterclockwise from position No. 1 to position No.2 (Figs- '1V and. 7A).,the sleeve 52 is turned 45 degrees counterclockwise and the axis -in counterclockwise direction whereby the gear 65 and shaft 58 are turned 90 degrees in clockwise direction about the axis S simultaneously with the counterclockwise movement of the axis '8 from its position in Fig. 6A to its position in Fig. 7A and the axis E of the journal 48 is swung in clockwise direction 90 degrees about the axis S and, therefore, travels in a straight path along the line a out of concentric relation with the axis of the rotor 24 to the position as shown in Fig.

7A. In other words, during the adjustment of the journal 48 from its position in Fig. 6 to its position in Fig. '7, the angle E--BS always equals the angle B-E-S so that the axis E of the eccentric journal 48 travels in a straight path along the line of adjustment a (Fig. 7A).

When the handle 68 is shifted counterclockwise from its position in Fig. 6 to position No. 3 (Fig. 8) the sleeve 52 is turned 90 degrees counterclockwise and the axis S is swung 90 degrees counterclockwise from its position in Fig. 6A to its position in Fig. 8A. The shaft 58 is simultaneously turned 180 degrees in clockwise direction about the axis S whereby the axis E of the journal 48 is swung 180 degrees clockwise about the axis S from coincidence with the axis 0 of the rotor 24 (Fig. 6A) into coincidence with the axis B of the hub 53 (Fig. 8A) Since radius B-S equals radius S--E- and the axis E is swung at twice the speed about the axis S than the axis S is swung about the axis B, the axis E of the journal 48 travels in a straight path along the line a from its position in Fig. 6, to the position in 7, and finally to the position in Fig. 8, in the manner as diagrammatically illustrated in Figs. 6A,

' -'IA, and 8A, whereby the eccentricity of the axis E of journal 48 with respect to the axis 0 of the rotor 24 is considerably increased above that obtained in position No. 2.

When the handle 68 is shifted 135 degrees counterclockwise from position No. 1 (Fig. 6) to position No. 4 (Fig. 9), the shaft 58 is rotated 270 degrees in counterclockwise direction and the axis E of the journal 48 is shifted along line a to the position shown in Fig. 9A, so that a further increase of the eccentricity of the journal 48 relative to the rotor axis 0- is obtained. The last position, No. (Fig. 10) illustrates the handle 180 degrees from its original position No. 1, and the axis E of the journal 48 (Fig. 10A) shifted along the line a to the maximum eccentric position relative to the axis O of the rotor 24. With the eccentric journal 48 so disposed the pump will operate at its full capacity causing full flow of fluid from the intake port 22 to the discharge port 23.

From the foregoing it is apparent that the eccentric journal 48 travels, during its adjustment to the various positions shown in Figs. 6 to 10, or to any intermediate position (not shown), along a straight line, i. e., along the line Of adjustment a which is transverse to the line of flow of fluid through the pump whereby a reduction of the suction efliciency of the pump or hammering thereof in any position is prevented. Moreover, in view of the particular shaft and sleeve arrangement of the present invention, the flared heads 56 and 51 of the shaft 58 and sleeve 52 present a flat surface in the same plane as the inner face of the cover 54 irrespective of the position of adjustment of the eccentric i'jo ur'nal thereby eliminating openings or pockets in the pumping chamber is in which foreign matter can collect and remain during the periods the pump is not in operation whereby contamination of the fluid passing through the pump is prevented.

' g It is, therefore; apparent that the adjusting mechanism of the present invention permits accurate adjustment of the eccentric journal 48 to any desired position between zero and maximum output of the pump, i. e., between position No. 1 and position No; 5, so that any desired fractional flow of fluid through the pump may be obtained. The outer face of the cover 54 (Fig. 2) is preferably provided with graduations 18 or indicia for indicating the volume of discharge of the pump for the various positions of the handle 68.

ing the operation of the pump without loss of liquid therefrom. To increase or decrease the volume of discharge of the pump the wing nut 68 is loosened to release the friction, between the flared heads 56 and 51 of the shaft 50 and sleeve 52 and their respective seats 58 and 59 suiflciently to permit movement of the handle 68 in the desired direction to thereby shift the eccentric journal 48 until the desired volume of discharge is obtained and thereafter the wing nut 68 is again tightened to secure the sleeve, shaft, and eccentric journal in adjusted position.

I desire it to be understood that the invention is not limited to the particular application or precise details of construction illustrated, but that various applications, modifications, and variations may be resorted to without departing from the spirit or scope of the invention, and I deem myself entitled to all such applications, modifications, and variations as come within the scope of the claims appended hereto.

I claim: a

l. A rotary pump comprising a casing having a chamber, a rotor rotatably mounted in said chamber, a block and impeller rotatable with said rotor and eccentrically movable relative thereto, a hub on said casing having its longitudinal axis eccentrically disposed to the axis of rotation of the rotor, a sleeve rotatably mounted in said hub and having an eccentric bore, a shaft rotatably mounted in the bore of said sleeve and provided with an eccentric journal extending into said chamber for rotatably supporting said block and impeller therein, means for connecting said sleeve and shaft for positive simultaneous rotation in opposite directions, and means for facilitating manual operation of said connecting means for changing the position of the journal in said chamber to thereby increase or decrease the eccentricity of the block and impeller relative to the rotor said sleeve and shaft rotating means comprising a gear fixed to said housing, a gear secured to said shaft, a double idler gear having toothed engagement with said gears on said housing and on said shaft, and idler support means secured to said sleeve to rotate therewith.

2. A rotary pump comprising a casing having a chamber, a rotor rotatably mounted in said chamber, a block and liquid impelling means rotatable with said rotor and eccentrically movable relative thereto, a hub on said casing having its longitudinal axis eccentrically disposed to the axis or rotation of the rotor, a sleeve rotatably mounted in said hub and having an eccentric 3 bore; -.a shaft mtatably mounted thebore of said sleeve and provided with an-eccentrio journal extending into said chamber for rotatably supporting the block andliquid impelling means therein, and means forrotat'rng thesleeve in one direction and for effecting simultaneous rotation of the shaft and journal 'at equalspeeds in ean opposite direction .relative to said hub to "thereby change the position of the journal along a straight line within said chamber to increase :or decrease the eccentricity of the block and liquid impelling means relative to the rotor :said sleeve and shaft rotating means comprising :a gear fixed to :said housing, a gear secured to said shaiit, a double idler :gear having toothed engagement with said gears on said housing and on said shaft, :and idler support means secured-to said sleeve to rotate therewith, said idler support n eansgcomprising 1a manipulating handle extending radially from said sleeve.

. 3; A rotary pump "comprising a casing having .a chamber and a liquid inlet and liquid outlet communicating therewith, a rotor .rotatably mounted in said chamber, a :shuttle block, "means connecting said shuttle block to said rotor and -permitting relative .movement of said shuttle block with respect to the rotor, a hub on'said casing. having its longitudinal axis eceentrically disposed to the axis .of rotation of the rotor, a sleeve ,rotatably mounted in said hub and having an eccentric here said sleeve extending axially beyond said housing, .a shaft rotatably mounted in the bore of said sleeve and provided with an eccentric journal extending into said chamber for rotatably supporting the shuttle and piston therein, said shaft extending axially beyond said sleeve, and idler means bodily movable around the axis of said sleeve and having driving engagemen't withsaid sleeve, said housing and said shaft jor efie'cting siimiltaneous rotation of the shaft and journal at a speed equal to that of the sleeve in an opposite direction relative to said casing to thereby change the position .of the journal in a plane normal to the flow of liquid through said inlet and outlet to increase or decrease the eccentricity of the shuttle block relative to the rotor.

4. A rotary pump comprising a casing provided with a chamber, a rotor, a block, and an impeller rotatable and relatively movable in said chamber, means for adjusting the block and the impeller eccentrically relative to the rotor, said means comprising a bearing extending laterally of said casing and having its longitudinal axis disposed eccentrically relative to the axis of rotation of the rotor, a sleeve rotatably mounted in said bearing and having a bore the axis of which is eccentrically disposed relative to the axis of said bearing andadapted to bisect, the distance between the latter and the axis of the rotor, a shaft rotatably mounted in the bore of saidsleeve and provided with a journal disposed eccentrically relative to the axis of the bore a distance equal to the eccentricity of the axis of the bore relative to the axis of the bearing and extending having difierential driving engagement with said sleeve, said casingand said journal-shaft. 5. Apparatus tor moving an eccentric journal in a straight .line relative to a ,fixed axis :of a ,pump housing com-prising a pump housing, :a hub extending, laterally of said housing in'parallelism with respect to the fixed ax-is thereogsa bearing rotatable in said hub and having an eccentric bore, :a shaft rotatable the bore-of said bearing, an eccentric journal supported in the housing by said shaft, means manually .rotatable for turning said bearing, an idler :carriedgby -said :manua'lly rotatable means and driving'ly engaging saidhub so as :to-rotate upon turning :of said bearing, and handle means carried by :said shaft and:operativelyconnected {to saidgidler for rotating said {shaft in a direction opposite to the direction of rotation of said bearing :at an equal speed thereto.

'6. Apparatus iorwm'oving an eccentric journal ajstraig'ht line relative to the fixed axis (of a pump housing comprising a pump-housing, 2a hubiormed :on said housing, a bearing rota-table in said :hub and having ."an eccentric bore; :a shaft .rotatably mounted in the bore of :said bearing, an eccentric journal supported :by said shaft and disposed within the housing, a lever keyed to said bearing, a gear keyed to 'saidrshazit, said hub having an annular rack adjacent said lever, and a pair of pinion gear carried said lever for 'drivingly connecting the gear keyed to said shaft and the annular rack on said hub whereby rotation of said lever relative to said hub effects simultaneous rotation to said bearing and shaft a'tequal speeds in opposite direc- "tions relative to said hub for effecting straight 'l-inelad'j-ustment of said journal within said:- pump housing. v V j lplin a' rotary pump a housing enclosing a rotor and an impeller associated therewith, means "for adjusting the axis of said impeller relative to the axis of said rotor-comprising a hub extending laterally of said housing, afbearin'g rotatable in said hub and having an eccentric bore, a shaft rotatable in the bore of said bearing, an eccentric journal secured to said shaft and extending into said housing for supporting said impeller for rotation therein, a lever "for facilitating manual turning of said bearing relative to said hub, said hub having ana-nnular rack, a pin carried by said lever in parallelism with the axis of said hub, a gear on said pin .meshing with said annularrack, and means drivingly connecting said pin and shaft in such a manner that turning of .said lever effects simultaneous inverse directional turning of said bearing and shaft at equal speeds relative to said hub jfor shifting said ,journal diametrically of said housing.

8. Arotary pumpcomprising a casing having .a cylindrical chamber with .one end thereof closed andthe other open, .a rotor mounted to rotate concentrically insaid chambenan impeller rand'shu'ttle block ,mounted in said rotor, a rotor drive shaft journaled in the .closed end of said chamber and extending axially therefrom, a closure cap mounted in hermetically sealed position over the open .end of .said chamber, the cap having a bore therethroug'h Whose axis is parallel but eccentric to that of the rotor drive shaft, an arcuate rack .on said cap, a sleeve having an eccentric bore journaled in said cap bore, one end of said sleeve adjacent said chamber being sealed -flush with the closure cap, the other end of said sleeve extending exteriorly of the casing,

a gear mounted on the extending end of said sleeve, a journal support shaft journaled in the eccentric bore of said sleeve, an end of said shaft extending exteriorly of said sleeve, a journal mounted on an inner end of said shaft eccentrically thereto, said journal operatively engaging said shuttle block, a gear mounted on the extending end of said shaft, a handle mounted on the sleeve extending from the cap for rotative manipulation thereof, and a double planetary idler journaled on said handle and having differential drive engagement with the arcuate rack on the housing and with the gear on the journal shaft to rotate the sleeve and the journal shafts at equal speeds in opposite directions upon swinging movement of said handle to vary the eccentricity of the journal alonga diameter of the casing.

9. A rotary pump comprising a casing having a cylindrical chamber with one end thereof closed and the other open, a rotor mounted to rotate concentrically in said chamber, an impeller and shuttle block mounted in said rotor, a rotor drive shaft journaled in the closed end of said chamber and extending axially therefrom, a closure cap mounted in hermetically sealed position over the open end of said chamber, the cap having a bore therethrough whose axis is parallel but eccentric to that of the rotor drive shaft, an arcuate rack on said cap, a sleeve having an eccentric bore journaled in said cap bore, the end of said sleeve adjacent said chamber being sealed flush with the closure cap, the other end of said sleeve extending exteriorly of the casing, a gear mounted on the extending end of said sleeve, a journal support shaft journaled in the eccentric bore of said sleeve, the end of said shaft adjacent said chamber being sealed flush with the end of the sleeve adjacent the chamber, the other end of said shaft extending exteriorly of said sleeve, a I

journal mounted on an inner end of said shaft eccentrically thereto, said journal operatively engaging said shuttle block, a gear mounted on the extending end of said shaft, a handle mounted on the sleeve extending from the cap for rotative manipulation thereof, and a double planetary idler journaled on said handle and having differential drive ratio engagement with the arcuate rack on the housing and the gear on the journal shaft to rotate the sleeve and the journal shafts at equal speeds in opposite directions upon swingand extending axially therefrom, a closure cap mounted in hermetically sealed position over the open end of said chamber, the cap having a bore therethrough whose axis is parallel but eccentric to that of the rotor drive shaft, an arcuate rack on said cap, a sleeve having an eccentric bore journaled in said cap bore, the end of said sleeve adjacent said chamber being sealed flush with the closure cap, the other end of said sleeve extending exteriorly of the casing, a journal support shaft journaled in the eccentric bore of said sleeve, an end of said shaft extending exteriorly of said sleeve, a journal mounted on an inner end of said shaft eccentrically thereto, said journal operatively engaging said shuttle block, and bodily movable control means having differential drive ratio engagement with the housing and the extending ends of the sleeve and the journal shaft to rotate the sleeve and the journal shafts at equal speeds in opposite directions upon bodily moving said control means to vary the eccentricity of the journal along a diameter of the casing.

11. In a rotary pump the combination of a casing having a chamber, a rotor, a shuttle block, and a liquid propelling means rotatable and relatively movable in said chamber; means for adjusting said shuttle block eccentrically relative to said rotor comprising a sleeve rotatable about an axis eccentric to the axis of the rotor, said sleeve extending axially beyond said casing and having an eccentric bore, a shaft rotatably mounted in the bore of said sleeve and extending axially beyond said sleeve, said shaft being provided with an eccentric journal extending into the chamber for supporting the shuttle block therein; and means for facilitating manual rotation of said sleeve and shaft simultaneously in opposite directions for changing the position of the eccentric journal within said chamber, said latter means comprising a lever fixedly secured to the axially extending end of said sleeve, a

driven element connected to the axial portion of said shaft and drive means carried by said lever and operatively engaging said shaft.

CHARLES E. KERR.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,757,483 Hele-Shaw May 6, 1930 2,018,692 Waite Oct. 29, 1935 2,349,773 Thompson May 23, 1944 2,893,128 Temple -4 Jan. 15, 1946 FOREIGN PATENTS Number Country Date 4,213 Great Britain 1818 

